21SSD: a public data base of simulated 21-cm signals from the epoch of reionization
21SSD: a public data base of simulated 21-cm signals from the epoch of reionization
复制标题
21SSD：再电离时代模拟 21 厘米信号的公共数据库
DOI：
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
M. Caillat
中科院分区：
文献类型：
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作者：
B. Semelin;Evan Eames;F. Bolgar;M. Caillat
来自再电离时代 (EoR) 的 21 厘米信号预计将在未来几年内通过现有仪器或即将推出的 SKA 和 HERA 项目进行检测。在这种情况下，迫切需要公开可用的高质量模板，涵盖广泛的可能信号。这些对于即将推出的仪器的端到端模拟以及开发信号分析方法都是必需的。在这项工作中，我们提供了这样一组公开可用的模板，可以通过此 https URL 下载。该数据库包含高分辨率和低分辨率的 21 厘米亮度温度光锥，以及涵盖我们选择的 3D 参数空间的 45 个模型的几个派生统计量。这些数据是使用 LICORICE 代码执行的完全耦合辐射流体动力学高分辨率 ($1024^3$) 模拟的结果。执行 X 射线和莱曼线传输是为了考虑加热和 Wouthuysen 场耦合波动。我们还首次利用功率谱和像素分布函数 (PDF) 作为红移函数，根据光锥数据计算得出数据。我们分析了改变模型参数时这两个量的表现，同时考虑了典型 SKA 测量预期的热噪声。最后，我们证明功率谱和 PDF 具有不同的（并且在某种程度上是互补的）区分不同模型的能力。这为根据所选诊断制定参数空间的最佳采样打开了大门。
The 21-cm signal from the Epoch of Reionization (EoR) is expected to be detected in the next few years, either with existing instruments or by the upcoming SKA and HERA projects. In this context there is a pressing need for publicly available high-quality templates covering a wide range of possible signals. These are needed both for end-to-end simulations of the up-coming instruments, as well as to develop signal analysis methods. In this work we present such a set of templates, publicly available, for download at this https URL. The database contains 21-cm brightness temperature lightcones at high and low resolution, and several derived statistical quantities for 45 models spanning our choice of 3D parameter space. These data are the result of fully coupled radiative hydrodynamic high resolution ($1024^3$) simulations performed with the LICORICE code. Both X-ray and Lyman line transfer is performed to account for heating and Wouthuysen-Field coupling fluctuations. We also present a first exploitation of the data using the power spectrum and the Pixel Distribution Function (PDF) as functions of redshifts, computed from lightcone data. We analyse how these two quantities behave when varying the model parameters while taking into account the thermal noise expected of a typical SKA survey. Finally, we show that the power spectrum and the PDF have different -- and to some extent complementary -- abilities to distinguish between different models. This opens the door to formulating an optimal sampling of the parameter space, dependant on the chosen diagnostics.
影响因子：
4.9
作者：
Kern, Nicholas S.;Liu, Adrian;Greig, Bradley
通讯作者：
Greig, Bradley